When you already set a real closed window at home, opening the window early in the morning will be a way to get a real fresh air in the morning. The opened window also let the sunlight entering the room. The amount of the sun light that is entering the room will depend on different stuff. The first is your home position. Different position on the window in your home position will have different level of sunlight. The second is set on the exterior situation. Having big tree near the window will most likely reduce the sunlight percentage to enter the room.
For more reasonable point you will need Blinds. this kind of windows base support is available mostly for windows with glass material around. The office tall building as example will be the side that really interested to manage the natural daylight more. This is highly wanted because it will cut the spending on light during the day.
If you demand for an elegant option, the Venetian Blinds will be yours. You may already watch this kind of window light management support in the old movie. Actually that will be a good reference on how such old design actually still high on demand. The only thing that you will need to know for sure is the length for the cover.